Upgrade guide for Grid v7.0.2

Deprecated the html config of Mask and Grid's loadMask config.

The html config of Mask is now deprecated. Please use the text config instead.

Old code

new Grid({
    loadMask: {
        html : '<div>Loading data...</div>'
    }   
})

New code

new Grid({
    loadMask: {
        text        : '<div>Loading data...</div>',
        htmlEncode  : false
    }
})